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Abstract: Phenotypic and functional alterations of dendritic cells induced by human herpesvirus 6 infection

  [ 35 votes ]   [ Discuss This Article ]
www.ProHealth.com • December 5, 2002


J Virol 2002 Oct;76(20):10338-45  Kakimoto M, Hasegawa A, Fujita S, Yasukawa M.

First Department of Internal Medicine, Ehime University School of Medicine, Shigenobu, Ehime 791-0295, Japan.

Human herpesvirus 6 (HHV-6) has a tropism for T lymphocytes and monocytes/macrophages, suggesting that HHV-6 infection affects the immunosurveillance system.

In the present study, we investigated the HHV-6-induced phenotypic and functional alterations of dendritic cells (DCs), which are professional antigen-presenting cells. HHV-6 infection of monocyte-derived immature DCs appeared to induce the up-regulation of CD80, CD83, CD86, and HLA class I and class II molecules, suggesting that HHV-6 infection induces the maturation of DCs.

In addition, the antigen capture capacity of DCs was found to decrease following infection with HHV-6. In contrast to up-regulation of mature-DC-associated surface molecules on HHV-6-infected DCs, their capacity for presentation of alloantigens and exogenous virus antigens to T lymphocytes decreased significantly from that of uninfected DCs. In contrast, there appeared to be no reduction in the capacity for presentation of an HLA class II-binding peptide to the peptide-specific CD4(+) T lymphocytes.

These data indicate that HHV-6 infection induces phenotypic alterations and impairs the antigen presentation capacity of DCs. The present data also suggest that the dysfunction of HHV-6-infected DCs is attributable mainly to impairment of the antigen capture and intracellular antigen-processing pathways.

PMID: 12239310 [PubMed - indexed for MEDLINE]




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